build(deps): bump sphinx from 7.2.6 to 8.0.2 in /requirements

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.2.6 to 8.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.0.2/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.2.6...v8.0.2)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/requirements_doc.txt

@@ -1,4 +1,4 @@
-Sphinx==7.2.6
+Sphinx==8.0.2
 ansys-sphinx-theme==0.16.6
 sphinx-copybutton==0.5.2
 sphinx_toolbox==3.7.0